ICMP-based Traceroute Every time I mention traceroute, I get a lot of people commenting that they are not able to perform one because ICMP, the protocol traceroute uses, is blocked or routed differently in their environment.

This article has two messages to deliver. The first being the technical piece where I review what the ICMP message means and what we tried to resolve the issue. The second is to illustrate the methodology used. I wanted to make those statements because in the past, some readers tend…

I feel sorry for ping. Ping has been beaten up, abused, misunderstood, banned and even tossed aside. Ping was originally used to check if a device was up or down, period. Back in the day, equipment failure was very common. I chuckle thinking back at those sales people that used…